The element with atomic number 8: oxygen, is the most abundant element on earth by mass.
It makes up almost 50% of the Earth’s mass and its atmosphere.
Oxygen is produced from water by cyanobacteria, algae and plants during photosynthesis and is used in cellular respiration for all complex life.
All of major molecules in living organisms, such as proteins, carbohydrates, and fats, contain oxygen.
The name oxygen was coined by Antoine Lavoisier in 1777.
The second most common element is #14: silicon.